--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -1476,7 +1476,7 @@ browse_save_fname(buf)
 #endif
 
 /*
- * Ask the user what to do when abondoning a changed buffer.
+ * Ask the user what to do when abandoning a changed buffer.
  * Must check 'write' option first!
  */
     void
@@ -4153,6 +4153,82 @@ ex_language(eap)
 }
 
 # if defined(FEAT_CMDL_COMPL) || defined(PROTO)
+
+static char_u	**locales = NULL;	/* Array of all available locales */
+static int	did_init_locales = FALSE;
+
+static void init_locales __ARGS((void));
+static char_u **find_locales __ARGS((void));
+
+/*
+ * Lazy initialization of all available locales.
+ */
+    static void
+init_locales()
+{
+    if (!did_init_locales)
+    {
+	did_init_locales = TRUE;
+	locales = find_locales();
+    }
+}
+
+/* Return an array of strings for all available locales + NULL for the
+ * last element.  Return NULL in case of error. */
+    static char_u **
+find_locales()
+{
+    garray_T	locales_ga;
+    char_u	*loc;
+
+    /* Find all available locales by running command "locale -a".  If this
+     * doesn't work we won't have completion. */
+    char_u *locale_a = get_cmd_output((char_u *)"locale -a",
+							NULL, SHELL_SILENT);
+    if (locale_a == NULL)
+	return NULL;
+    ga_init2(&locales_ga, sizeof(char_u *), 20);
+
+    /* Transform locale_a string where each locale is separated by "\n"
+     * into an array of locale strings. */
+    loc = (char_u *)strtok((char *)locale_a, "\n");
+
+    while (loc != NULL)
+    {
+	if (ga_grow(&locales_ga, 1) == FAIL)
+	    break;
+	loc = vim_strsave(loc);
+	if (loc == NULL)
+	    break;
+
+	((char_u **)locales_ga.ga_data)[locales_ga.ga_len++] = loc;
+	loc = (char_u *)strtok(NULL, "\n");
+    }
+    vim_free(locale_a);
+    if (ga_grow(&locales_ga, 1) == FAIL)
+    {
+	ga_clear(&locales_ga);
+	return NULL;
+    }
+    ((char_u **)locales_ga.ga_data)[locales_ga.ga_len] = NULL;
+    return (char_u **)locales_ga.ga_data;
+}
+
+#  if defined(EXITFREE) || defined(PROTO)
+    void
+free_locales()
+{
+    int			i;
+    if (locales != NULL)
+    {
+	for (i = 0; locales[i] != NULL; i++)
+	    vim_free(locales[i]);
+	vim_free(locales);
+	locales = NULL;
+    }
+}
+#  endif
+
 /*
  * Function given to ExpandGeneric() to obtain the possible arguments of the
  * ":language" command.
@@ -4168,7 +4244,25 @@ get_lang_arg(xp, idx)
 	return (char_u *)"ctype";
     if (idx == 2)
 	return (char_u *)"time";
-    return NULL;
+
+    init_locales();
+    if (locales == NULL)
+	return NULL;
+    return locales[idx - 3];
+}
+
+/*
+ * Function given to ExpandGeneric() to obtain the available locales.
+ */
+    char_u *
+get_locales(xp, idx)
+    expand_T	*xp UNUSED;
+    int		idx;
+{
+    init_locales();
+    if (locales == NULL)
+	return NULL;
+    return locales[idx];
 }
 # endif